Malicious PDF — malware analysis report

Static analysis result for SHA-256 8349da0b88a26df1…

MALICIOUS

PDF

59.5 KB Created: 2021-09-17 05:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f06c9e30c0b56a04307e3619f9489e13 SHA-1: 6f1e3a9ecc8b65155489ab0fa01c171aceda6e60 SHA-256: 8349da0b88a26df121cb55a228f99a218ee3238c3bf89384bebefd76977f85b1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5307

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=hero+legend+mod+apk PDF link annotation
    • http://feldbach-tourismus.at/files/xumixujilexuzorebe.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/86267529869.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90fd54334---82514249773.pdfIn PDF document text
    • https://windsbs.biz/files/file/kegefub.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911042349386362167.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/29484552079.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/86945314593.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/zawuko.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/subewofovejewolefekuga.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/92370338547.pdfIn PDF document text
    • https://olterus.com/contents/files/59791111446.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/77591266938.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e9eba8a---wezanufigum.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/maxakivovijowilineva.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/jonezoxetajipabi.pdfIn PDF document text
    • https://kvzriu.org/images/file/17545992125.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6pjr9u267fq8v5m0m12pfrclin/lapexulafesisafawul.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/5672408394.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/kanelugadilaruzujut.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/sololatewezel.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gufiguxulumenuwekeziw.pdfIn PDF document text
    • http://air-ned.com/uploads/files/22250873977.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jezezigisebobiwavokiro.pdfIn PDF document text

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